Full
Outline
An improved power balance modulation strategy based on carrier stacking modulation is proposed to address the issue of output power imbalance caused by different modulation methods used in low-voltage units in hybrid cascaded H-bridge inverters under the traditional modulation strategies. Based on the topology of an asymmetric hybrid cascaded H-bridge 11-level inverter, the symmetrical characteristics of the low-voltage unit control pulse signal under carrier stacking modulation were analyzed. Moreover, the low-voltage unit pulse control signal was segmented using T/4 or T/2 as cycles, and all the control pulse combinations under each segmentation method were given. The optimal working mode was selected based on the minimum carrier shift times and the shortest power balance time. As a result, the output voltage between low-voltage units was symmetrical, and the output power of low-voltage units was self-balanced. Finally, the proposed modulation strategy was validated through simulation and experiments.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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